Machine tool attachment



Nov. 6, 1945. L. A. GARDINER MACHINE TOOL ATTACHMENTA `Filed July 19,194s I e sheets-shet 1 I nventor pl i Lz'rzzz/iemfardi/zef Nov. 6, 1945.L. A. GARINER 2,388,320

Y MACHINE TOOL ATTACHMENT Filed Juiy 19, 1943 6 sheets-sheet 2 Inventorj?? 2 Lz'zzzz'erisfmasardi/zer Nov. 6, 1945. A. GARDINR 2,388,320

MACHINE TOOL ATTACHMENT `6 Sheets-Sheet 5 Filed July 19, 1943 I Inventor ,/lz'rzzieriemas ardz'zzer Nov. 6, 1945. A GARmNER 2,388,320

T lMACHINE TOOL ATTACHMENT l Filed July 19, 1943 6 Sheets-Sheet 4 Bi uwInventor WWW NOV- 6, 1945- l.. A. GARDINER 2,388,320

MACHINE TOOL ATTACHMENT Filed July 19, 194:5 esmas-sheet 5 NOV 6 1945. lA A. GARDINER 2,388,320

MACHINE TOOL ATTACHMENT Filed July, 19, 1943 6 Sheets-Sheet 6' PatentedNov. 6, 1945 Y 2,388,320; V a a Y Y MACHINE TooL ATTACHMENT Y LinzieArtemas Garainesmxigton, Ky.

A Application July 19, 1943, Serial No. 495,331

s claims. ciw-e4);

chines, milling machines, etc. i

An important object of the invention is to pro- Yvidean attachment formachines of the aforementioned character which eliminates the necessityof laying out the work and which, further, is adapted to beexpeditiouslyV and accurately adjusted to hold said work in anyposition.

Another very important object of the invention is to provide a machinetool attachment of the character described comprising novel means forlocking the work holder` in adjusted position as well as for releasingand freeing said work holder simultaneously in one operation.

Still another very important object of the invention is to provide awork holding attachment of the character described for machine toolswhich comprises unique means for accurately centering and guiding adrill over the work.

Other objects of the invention are to provide a machine tool attachmentwhich will be comparatively simple in construction, strong, durable,highly eflicient and reliable in use, compact, and which may bemanufactured at low cost.

All of the foregoing and still further objects and advantages of theinvention will become apparent from a stpdy of the followingspecification taken in connection with the accompanying drawings whereinlike characters of reference designate corresponding parts throughoutthe several views,

and wherein- Figure 1 is a top plan view of a machine tool attachmentconstructed in accordance with the present invention, showing the deviceassembled for use on a drilling machine.

Figure 2 is an elevational view of the device.

Figure 3 is a vertical sectional view, taken substantially on the line3-3 of Figure 1.

Figure 4 is a vertical sectional view, taken sub` stantiallyon the line4-4 of Figure 2.

` Figure 5 is a view in horizontal section, taken substantially on theline 5-5 of Figure 3.

Figure 6 is a bottom plan view oi the rotatably adjustable index plate.

Figure 7 is a view in horizontal section, taken Figure 10 is 'a viewinvertical section through the workeclampingr means. J i. i f .Figure 11is Aa top plan` view, illustrating'the means for centering the drillguide arm overthe indexplate.` i .Y i Referring now 5to the drawings indetail, it will be seen that the embodiment of the invention which `hasbeen illustrated comprises a metallic basel which is,` adjustablysecured to the machine bed 2 Aby bolts 3.' Rising from the base Iis apair of spaced, opposed plate-like brackets 4 `have ing aligned bearings5 in `theirupp'er Aportions adjacent one ofthevertical edges thereof.

Headed pins 6 are journaled inthebearings. Fixed on the pins 3 forswinging adjustment in a vertical plane is a circular master plate lofsuitable metal. The mastervplate` 'l comprisesdepending segments 8through `which the pins B pass, said segments having Varcuate slots:9therein which accommodatethumb screws I0 for securing said plate l inadjusted position. The screws I0 are threadedly mounted inthe `brackets4. Scales II on the segments 8 facilitate adjusting the master platel-to the desired inclination, said scales being cooperable with centermarks I2 `on the brackets 4.. Fixed on the inner end portions ,of thepins 6 is a depending yoke I3. A conical thrust bearing Ill` is mountedin the yoke I3, the purpose of which will be presently set forth.,

The master-plate 'l further includes a centrally located, tubularbearing I5 which depends into the yoke I3. Mounted in the bearing I5 isa bushing I6.` Aniinternally tapered, tubular stem I1 is journaled inthe bushing Iii. The stem I1 comprises an enlarged, externally threadedupper end'portion I8. Formed integrally with the stem I1, below theportion I 8 thereof, is a circular, peripherally calibrated index plateI9. The index plate I9 comprises a removable disk 20 which is recessedinto the lower face of said index plate. A thrust washer or bearing 2Ispaces the disk 20 from the master plate 'l and carries the load, saidthrust washer encircling the upper end portion of the bushing I6. a v

As illustrated to advantage in Figure 6 of the drawings, the disk 20 hasformed therein concentric series of openings 22, the circumferentialspacing of which varies. Mounted beneath the master plate 'I andprojecting upwardly therei through for engagement in the openings 22 isa mounted in a removable housing 24 which is threadedly 'mounted inthelower portion of thev spring pressed, manually retracted, reversiblepawl 32 is slidably mounted in the lever 3Iv andengageable with theratchet teeth 29 fory operatively connecting the nut 26 to said leverfor actuation in either direction thereby. A ringU 33 is mounted betweenthe nut 26 and the lower end of the bushing I6 and the tubular bearingI5.

Referring now to Figure 10 of the drawings, the work, as at 34, in thearrangement which has heenillustrated, is mounted in position on theindex plate I9 in vertically spaced relation thereto by means includinga spacing ring 35. The ring 35 encircles the portion I6 of the stem I1in spaced, concentric relation thereto, said ring slipping over anannular shoulder 36 which rises from the plate I9. A cap 31 is threadedon the opstanding neck I8. Rising from the cap 31 is a threaded shank38. A substantially cup-shaped nut 39 is threadedly mounted on the shank38 and is engageable with the work 34 over the cap 31 for rmly clampingsaid work on the spacing ring 35. y

Also rising from the base I is a socket 49. A post 4I is journaled inthe socket 40.. A thumb screw 42 on the socket 40 is engageable with aflat portion 43 of the post 4I for securing said post against rotationin adjusted position. Also rising from the base I, on the diametricallyopposite side of the master plate 1 from the post 4I, is a comparativelysmall post 44. The posts 4I and 44 may be readily removed from the baseI.

Fixed on the post 4I for swinging movement in a horizontal plane is aplate-like arm 45 having a longitudinal slot or opening 46 therein. Thearm 45 is provided, in one end portion,l with a hub or the like 41 whichis secured onthe post 4I by a thumb screw 48. The thumb screw 4B is alsoengageable with the flat side portion 43 of the post 4I. In its free endportion, the arm 45 has extending thereinto from one of its`longitudinal edges a notch or recess 49 for the reception of the post44. Y y n Referring to Figures 8 and 9 of the drawings, it will beobserved that a chambered plate 50 is mounted beneath the free end ofthe arm 45, Said plate having formed therein a transverse slot 5I. A.bolt 52 depends from theplate 50V and isladjustable in the slot 5I. Abushing V53 is secured by a nut 54 on the bolt 52, said bushing abuttingthe plate 50. The bushing 53 includes a. flange 55 on its lower end.Journaled on the bushing 53 is a pair of opposed, Vcoacting jaws856which are adapted t'o receive the post 44 therebetween forreleasablysecuring the arm 45 thereto. Operating handles 51 project fromthe pivoted ends of the jaws 56. A coil spring 58 is mountedbetween thehandles 51 for closingl the jaws 56. It will thus be seen that the jaws56 are` mounted for transverse adjustment beneath the free 'end portionof the arm 45 wherebymsaid arm, when itis connected to the post 44, maybe adjusted relative thereto to maintain accuracy.

master plate 1. The master plate 1 has formed vtherein staggeredthreaded openings 25 (see Fig- A screw shaft 59 is journaledlongitudinally on the arm 45, adjacent one of the longitudinal edgesthereof, in suitable bearings 6 I A drill guide 6 I is threadedlymounted on the screw shaft 59 and slidable thereby on the arm 45, saiddrill guide bridging the slot 46 and being engaged therein. A set screw62 is threadedly mounted in one end of the guide 6I and engageable withthe adjacent longitudinal edge of the arm 45 for frictionally clampingsaid guide in. adjusted position. The other end of the guide 6I travelsadjacent a scale 63 which is mounted longitudinally on the arm -45 inparallelism with the slot 46. This end portion of the guide 6I isbeveled and provided with a mark 64 which is cooperable with the scale63.

, A vertical tube 65 in the guide 6I receives the VononeY end of thescrew 59.

tool, as at 66. An operating crank 61 is provided A Vernier 68 on thescrewshaft 59 facilitates ne adjusting of the 'guide 6I.

When mounting the tool guide assembly on the base I, a. post 69 isprovided for accurately positioning the arm 45V above the index plateI9. Toward this end, the post 69 includes, on its lower end, a taperedshank 10 which is adapted to seat in the stem I1. The post 69 nts snuglyin the slot 46 in the arm 45. A channel 1I in the post 69 provides' theequivalent of a comparatively wide surface which is slidably engageablewith one of. the longitudinal side walls of the slot 46 (see Figure 11).

It is thought that the operation of the device will be readily apparentfrom a consideration of the foregoing, particularly to those skilled inthe art to which the invention pertains.V Briey, with the deviceassembledA and mounted for useV on a drilling machine, the work 34 isrmly secured in position above the index plate I9. Of course, the tool66 is moved downwardly through the tube 65 of the guide 6I forengagement with the work. Prior to the engagement of the tool 66 in theguide 6I said guide is adjusted on the arm 45 through the medium of thescrew 59 to the desired position. The bolt 23 is mounted in the masterplate 'I for engagement in the correct openings 22 in the disk 26. Thenut 26 is tightened through the medium of the ratchet lever 3I fordrawing the plate I9, with the work thereon, down tightly on the masterplate 1, the thrust washer ZI receiving the load. The work may now bedrilled. To release the index plate I9 for rotating the work to the nextposition, the pawl 32 is manually retracted and rotated one-half of arevolution for reversing said pawl. The ratchet lever `:il is then`actuated for unscrewing or loosem'nrg the rnut 26. As the nut 26 isthus unscrewed, said nut, turning on the thrust bearing I4, forces thestem I1. upwardly, thereby raising the plate I9 with the work thereon.The bolt 23 is then withdrawn and the plate I9 may be manually rotatedwith a minimum of eiort. When the position of the next drillingoperation is reached, the bolt 23 engages in the correct opening 22 andarrests the plate I9. Rocking or swinging adjustment of the master plate'I facilitates the drilling of holes at different angles in the work.When the attachment is to be used on shaping or planing, milling andother machines, the tool guide assembly comprising the members 4 Il, 44,45, etc., is removed.

It is believed that the many advantages of a `machine tool attachmentconstructed in accordance with the present invention will be readilyunderstood and although a preferred embodiment of the device is asillustrated and described, it is 2,388,320 y to be understood thatchanges in the `details .of

construction and in the combination and arrangement of parts may beresorted to which Will fall within the scope of the invention asclaimed. i

What is claimed is:

1. A machine tool attachment of the character described comprising abase for mounting on a machine tool, brackets rising from said base,pins journaled in said brackets, a circular plate fixed on the pins forrocking adjustment in a Vertical plane, a yoke xed on the pins, therockable plate including a centrally located, tubular bearing extendinginto the yoke, a stem journaled in the bearing, a circular plate fixedon the stem and rotatable above the rockable plate, means for securing apiece of work on the rotatable plate, a thrust bearing mounted on theyoke, a nut threadedly mounted on the stem and rotatably engaged withthe thrust bearing, said nut being operatively connected to the tubularbearing, and manually operable means for rotating the nut in oppositedirections for securing the rotary plate against rotation on therockable plate and for freeing said rotary plate from said rockableplate.

2. In a machine tool attachment, a master plate having a centraldepending tubular bearing, an index plate disposed upon the master plateand having a depending tubular stem journaled on said bearing, said stemhaving a projecting threaded lower end, a ring loosely disposed on thestem and engaged with the lower end of the bearing, a nut threaded onthe lower end of the stem below the ring and having peripheral ratchetteeth, and a lever having an end rotatably mounted on the nut andprovided with a reversible pawl engageable with the ratchet teeth of thenut so that the lever may be used to turn the nut in either direction todraw the index plate down tightly against the master plate or to freethe index plate from tight engagement with the master plate.

3. The construction defined in claim 2, in combination with a yokeextending beneath the nut, and a thrust bearing between the yoke and thenut whereby the stem and index plate are raised relative to the masterplate when the nut is turned to free the index plate.

LINZIE ARTEMAS GARDIN ER.

